US20060278377A1 - Module for cooling the charge air and recirculated exhaust gases from the internal combustion engine of a motor vehicle - Google Patents
Module for cooling the charge air and recirculated exhaust gases from the internal combustion engine of a motor vehicle Download PDFInfo
- Publication number
- US20060278377A1 US20060278377A1 US10/561,847 US56184704A US2006278377A1 US 20060278377 A1 US20060278377 A1 US 20060278377A1 US 56184704 A US56184704 A US 56184704A US 2006278377 A1 US2006278377 A1 US 2006278377A1
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- United States
- Prior art keywords
- recirculated exhaust
- charge air
- exhaust gas
- heat exchange
- cooling module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D9/0031—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other
- F28D9/0043—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other the plates having openings therein for circulation of at least one heat-exchange medium from one conduit to another
- F28D9/0056—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other the plates having openings therein for circulation of at least one heat-exchange medium from one conduit to another with U-flow or serpentine-flow inside conduits; with centrally arranged openings on the plates
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
- F02B29/04—Cooling of air intake supply
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
- F02B29/04—Cooling of air intake supply
- F02B29/0406—Layout of the intake air cooling or coolant circuit
- F02B29/0412—Multiple heat exchangers arranged in parallel or in series
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
- F02B29/04—Cooling of air intake supply
- F02B29/0406—Layout of the intake air cooling or coolant circuit
- F02B29/0418—Layout of the intake air cooling or coolant circuit the intake air cooler having a bypass or multiple flow paths within the heat exchanger to vary the effective heat transfer surface
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
- F02B29/04—Cooling of air intake supply
- F02B29/045—Constructional details of the heat exchangers, e.g. pipes, plates, ribs, insulation, materials, or manufacturing and assembly
- F02B29/0462—Liquid cooled heat exchangers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
- F02B29/04—Cooling of air intake supply
- F02B29/045—Constructional details of the heat exchangers, e.g. pipes, plates, ribs, insulation, materials, or manufacturing and assembly
- F02B29/0475—Constructional details of the heat exchangers, e.g. pipes, plates, ribs, insulation, materials, or manufacturing and assembly the intake air cooler being combined with another device, e.g. heater, valve, compressor, filter or EGR cooler, or being assembled on a special engine location
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
- F02B29/04—Cooling of air intake supply
- F02B29/0493—Controlling the air charge temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/02—EGR systems specially adapted for supercharged engines
- F02M26/09—Constructional details, e.g. structural combinations of EGR systems and supercharger systems; Arrangement of the EGR and supercharger systems with respect to the engine
- F02M26/10—Constructional details, e.g. structural combinations of EGR systems and supercharger systems; Arrangement of the EGR and supercharger systems with respect to the engine having means to increase the pressure difference between the exhaust and intake system, e.g. venturis, variable geometry turbines, check valves using pressure pulsations or throttles in the air intake or exhaust system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/11—Manufacture or assembly of EGR systems; Materials or coatings specially adapted for EGR systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
- F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
- F02M26/30—Connections of coolers to other devices, e.g. to valves, heaters, compressors or filters; Coolers characterised by their location on the engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
- F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
- F02M26/32—Liquid-cooled heat exchangers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M31/00—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture
- F02M31/20—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for cooling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/0066—Multi-circuit heat-exchangers, e.g. integrating different heat exchange sections in the same unit or heat-exchangers for more than two fluids
- F28D7/0075—Multi-circuit heat-exchangers, e.g. integrating different heat exchange sections in the same unit or heat-exchangers for more than two fluids with particular circuits for the same heat exchange medium, e.g. with the same heat exchange medium flowing through sections having different heat exchange capacities or for heating or cooling the same heat exchange medium at different temperatures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/0066—Multi-circuit heat-exchangers, e.g. integrating different heat exchange sections in the same unit or heat-exchangers for more than two fluids
- F28D7/0083—Multi-circuit heat-exchangers, e.g. integrating different heat exchange sections in the same unit or heat-exchangers for more than two fluids with units having particular arrangement relative to a supplementary heat exchange medium, e.g. with interleaved units or with adjacent units arranged in common flow of supplementary heat exchange medium
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D9/0031—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other
- F28D9/0043—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other the plates having openings therein for circulation of at least one heat-exchange medium from one conduit to another
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/001—Casings in the form of plate-like arrangements; Frames enclosing a heat exchange core
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
- F28D2021/008—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for vehicles
- F28D2021/0082—Charged air coolers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D21/0001—Recuperative heat exchangers
- F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
- F28F21/06—Constructions of heat-exchange apparatus characterised by the selection of particular materials of plastics material
- F28F21/067—Details
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F2250/00—Arrangements for modifying the flow of the heat exchange media, e.g. flow guiding means; Particular flow patterns
- F28F2250/10—Particular pattern of flow of the heat exchange media
- F28F2250/102—Particular pattern of flow of the heat exchange media with change of flow direction
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F2275/00—Fastening; Joining
- F28F2275/04—Fastening; Joining by brazing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- the invention relates to internal combustion engine motor vehicles.
- a cooling module consisting of a charge air cooler and of a recirculated exhaust gas cooler
- the charge air cooler comprising a heat exchange bundle for cooling the charge air
- the recirculated exhaust gas cooler comprising a heat exchange bundle for cooling the recirculated exhaust gases
- an inlet header box for the recirculated exhaust gases which is immediately adjacent to an inlet end of the recirculated exhaust gas cooler heat exchange bundle and an outlet header box for the recirculated exhaust gases immediately adjacent to an outlet end of the recirculated exhaust gas cooler heat exchange bundle
- a wrapper housing the charge air cooler heat exchange bundle and the recirculated exhaust gas cooler heat exchange bundle.
- the invention is aimed specifically at a cooling module that meets these objectives.
- the first of these objectives is achieved through the fact that the charge air cooler heat exchange bundle and the recirculated exhaust gas cooler heat exchange bundle are assembled in a single brazing operation and in that they are also assembled with one another during this same brazing operation.
- All or some of the components of the module can thus be made of a single material, for example aluminum and/or an aluminum alloy.
- the wrapper housing the heat exchange bundles of the charge air cooler and of the recirculated exhaust gas cooler is assembled with these bundles during the single brazing operation during which these bundles are assembled with one another.
- the wrapper is made of the same single material, for example aluminum and/or an aluminum alloy, as the cooler bundles.
- the wrapper comprises a first and a second peripheral rim which protrude on each side of the charge air cooler bundle, the charge air cooler inlet header box being assembled with one of these peripheral rims, the charge air cooler outlet header box being assembled with the other of these peripheral rims.
- the inlet and outlet header boxes of the charge air cooler are attached after the brazing operation has been performed. They can therefore be produced by molding in a different material, for example in plastic.
- the dimensions of the wrapper are chosen such that they delimit a first and a second empty space, one at the inlet end and one at the outlet end of the charge air cooler heat exchange bundle, the first and second empty spaces respectively constituting an inlet header box and an outlet header box for the charge air.
- the cooling module is entirely assembled in a single operation, including the inlet and outlet header boxes delimited by the wrapper itself.
- the module is then produced in a single material, for example an aluminum alloy.
- the wrapper comprises two half-casings. These two half-casings may be able to slide one with respect to the other in order to accommodate variations in height of at least one of the heat exchange bundles.
- each of the two half-casings advantageously has a U-shaped cross section comprising an end wall and two lateral edges situated one on each side of the end wall, the lateral edges of one of the half-casings sliding with respect to the lateral edges of the other half-casing.
- each of the two half-casings advantageously has the shape of a container comprising a peripheral rim, the peripheral rim of one half-casing being able to fit into the peripheral rim of the other half-casing and to slide with respect to the latter.
- the wrapper may, in one particular embodiment, comprise a pressed housing which accommodates the recirculated exhaust gas cooler bundle.
- the wrapper comprises a separate charge air cooler casing, this separate casing being brazed in a single operation to one of the two half-casings during the single brazing operation during which the bundles are assembled with one another.
- One of the half-casings may advantageously comprise an end wall that is taller to make it easier to install the recirculated exhaust gas cooler.
- the cooling module comprises a passage for the recirculated exhaust gases which opens directly into the outlet header box of the charge air cooler, the cross section of this passage being equal to or greater than the cross section of the recirculated exhaust gas cooler bundle.
- the inlet air and the recirculated gases are indeed mixed upstream of the inlet ducts.
- the gases can mix and their temperature can therefore even out, so that the temperature of the mixture is lowered.
- the passage cross section for the recirculated exhaust gases can be at least equal to the cross section of the recirculated exhaust gas cooler bundle allows these gases not to experience any pressure drop and improves the uniformity of the mixing.
- FIG. 1 is an external perspective view of a first embodiment of a cooling module according to the invention
- FIG. 2 is an exploded view, minus the header boxes, of the module depicted in FIG. 1 ;
- FIG. 3 is a view of the module of FIGS. 1 and 2 in cross section on a plane passing through the center of the exhaust gas inlet flange;
- FIG. 4 is a view of the cooling module in longitudinal section on a plane passing through the axis of one of the cooling water ducts;
- FIG. 5 is a detailed view in section illustrating the structure of the charge air cooler heat exchange bundle
- FIG. 6 is a perspective exterior view of a variant embodiment of the module of FIG. 1 ;
- FIG. 7 is a perspective view, minus header box, of the module of FIG. 6 ;
- FIG. 8 is an exploded perspective view of the module of FIGS. 6 and 7 ;
- FIG. 9 is an exterior view in perspective of a second embodiment of a cooling module according to the invention comprising added-on header boxes;
- FIG. 10 is a perspective view from beneath of the module of FIG. 9 ;
- FIG. 11 is a perspective view, minus header box, of the module of FIGS. 9 and 10 ;
- FIG. 12 is a view of the module of FIG. 9 in longitudinal section on a plane passing through the axis of one of the cooling water ducts;
- FIG. 13 is a view in cross section on a plane passing through the axis of the recirculated exhaust gas inlet flange;
- FIG. 14 is an exterior perspective view of a cooling module according to the invention, made entirely in aluminum;
- FIG. 15 is a view from above of the cooling module of FIG. 14 ;
- FIG. 16 is a view in section on XVI-XVI of FIG. 15 ;
- FIG. 17 is a view in section on XVII-XVII of FIG. 15 ;
- FIG. 18 is a view in section on XVIII-XVIII of FIG. 15 .
- the cooling module of the invention is intended to equip a motor vehicle having an internal combustion engine comprising two cooling circuits: a high-temperature first circuit for cooling the combustion engine and a low-temperature second circuit for cooling certain vehicle equipment items.
- This module consists of a charge air cooler and of a recirculated exhaust gas cooler.
- Each of these coolers itself consists of a heat exchange bundle, of an inlet header box immediately adjacent to an inlet end of the heat exchange bundle and an outlet header box immediately adjacent to an outlet end of the heat exchange bundle.
- the gas to be cooled namely the charge air or the recirculated exhaust gases, is introduced into the inlet header box of the cooler. It passes through the heat exchange bundle giving up heat to a cooling fluid, generally the water of the low-temperature circuit, then opens into the outlet header box.
- the charge air cooler bundle is denoted by the general reference 2 and the recirculated exhaust gas cooler bundle is denoted by the general reference 4 .
- the bundles 2 and 4 are separated from one another by an interface plate 5 ( FIG. 2 ).
- the bundles 2 and 4 are housed inside a common wrapper 6 .
- the wrapper 6 consists of two half-casings, namely a first half-casing 7 and a second half-casing 8 .
- Each half-casing 7 , 8 has a very elongate U-shaped cross section comprising an end wall 10 and two lateral edges 12 situated one on each side of the end wall 10 .
- the lateral edges 10 of the half-casings 7 and 8 are able to slide one with the other in such a way as to adjust the height of the wrapper 6 to accommodate dimensional variations in the heat exchange bundles 2 and 4 . This is because, as a result of manufacturing tolerances, the height of these bundles may vary slightly.
- One of the two half-casings in this instance the half-casing 8 , has a housing 14 , made for example by pressing and intended to accommodate the recirculated exhaust gas cooler bundle 4 .
- the housing 14 in one of its dimensions, directed along the longest dimension of the heat exchange bundle 4 , the housing 14 is dimensioned in such a way as to fit the length of the bundle 4 .
- the housing 14 in its other dimension, directed along the width of the heat exchange bundle 4 , is dimensioned in such a way as to form an empty space 16 at the inlet end 17 of the bundle 4 and an empty space 18 at the outlet end 19 of this same bundle.
- the empty spaces 16 and 18 thus respectively constitute an inlet header box 16 and an outlet header box 18 for the recirculated exhaust gas cooler.
- An inlet flange 20 is connected to an inlet duct 22 which opens into the inlet header box 16 ( FIG. 3 ).
- the flange 20 is for the connection of an inlet pipe (not depicted) carrying the exhaust gases that are to be cooled.
- An inlet duct 24 and an outlet duct 26 are also provided on the housing 14 of the half-casing 8 .
- the ducts 24 and 26 respectively let a cooling fluid, generally the water of the low-temperature circuit, in to an out of the recirculated exhaust gas cooler bundle 4 and the charge air cooler bundle 2 .
- the channels along which the cooling fluid circulates through the bundles 2 and 4 are connected in parallel. In other words, the ducts 24 and 26 are common to the two bundles, thus reducing the number of external connections to be made.
- the cooling module depicted in FIGS. 1 to 5 further comprises an inlet header box 30 and an outlet header box 32 for the charge air.
- the inlet 30 and outlet 32 header boxes of the charge air cooler are not directly delimited by the wrapper 6 but are added on. That allows them to be made of a material that differs from that of the wrapper 6 and of the heat exchange bundles 2 and 4 , for example of plastic.
- the inlet header box comprises an inlet duct 34 and the outlet header box an outlet duct 36 .
- the charge air enters the inlet header box via the duct 34 as depicted schematically by the arrow 38 , passes through the heat exchange bundle 2 , then opens into the outlet header box 32 before leaving the heat exchange module in the outlet duct 36 as depicted diagrammatically by the arrow 40 .
- each of the two half-casings 7 and 8 has a first and a second peripheral rim which protrude on each side of the charge air cooler bundle 4 .
- grooves are formed in the feet of the header boxes 30 and 32 . These grooves fit onto the peripheral rims of the half-casings 7 and 8 .
- the header boxes may be fixed to the wrapper by any appropriate means, for example adhesive bonding.
- each of the heat exchange bundles 2 and 4 consists of a stack of plates 42 between which there are corrugated inserts 44 constituting heat-exchange surfaces which improve the exchange of heat between the charge air that is to be cooled and the plates.
- Each plate is of roughly rectangular shape having two short sides and two long sides.
- Each plate comprises an end wall 46 bounded by a peripheral rim 48 .
- Ribs 50 may be provided in the end wall 46 of each of the plates to delimit circulation passages for the cooling fluid ( FIG. 2 ).
- the end wall 46 and the peripheral rim 48 determine a shallow dish.
- the plates are grouped together in pairs assembled by their peripheral rim 48 .
- the dish of the top plate and the dish of the bottom plate belonging to the same pair of plates combine to form a channel 52 through which the cooling fluid can circulate.
- two bosses 54 are formed along a short side of each of the plates.
- the bosses of a pair of plates press against the bosses of the adjacent plate pairs. This then produces an inlet manifold and an outlet manifold for the cooling fluid.
- the cooling fluid enters the bundle as depicted diagrammatically by the arrow 56 then flows through the circulation channels 52 as depicted diagrammatically by the arrows 58 .
- the fluid leaves the heat exchange bundle 2 in the opposite direction.
- the bosses 54 of two pairs of plates also between them determine circulation channels 60 for the charge air of the charge air cooler and for the exhaust gases of the exhaust gas cooler.
- Turbulence generators 44 are positioned in the circulation passages 60 .
- each circulation channel for the exhaust gases that are to be cooled may advantageously lie between two channels for the circulation of the cooling liquid.
- the wall of the pressed housing 14 and the interface plate 5 are not in direct contact with the gases that are to be cooled, the temperature of which may be very high (500° C.).
- these walls are cooled by the circulation of the cooling liquid. Their temperature is thus considerably lowered by comparison with the wall temperature of a conventional recirculated exhaust gas cooler. It may for example be of the order of 200° C.
- These walls can therefore be made in a material with less resistance to temperature, such as aluminum. This advantage is considerable because aluminum is easier to work and less expensive than stainless steel.
- the empty space 18 formed in the housing 14 which constitutes the outlet header box for the recirculated exhaust gas cooler is in direct communication with the interior space 70 of the outlet header box 32 of the charge air cooler.
- the cross section of the passage offered to the cooled recirculated exhaust gases is the cross section of the outlet header box 18 .
- This cross section is equal to the cross section of the exhaust gas cooler bundle 4 .
- FIGS. 6 to 8 depict a variant embodiment of the cooling module of FIGS. 1 to 5 .
- the overall construction of the cooler of FIGS. 6 to 8 is identical to that of the first embodiment. In consequence, the same elements have been denoted by the same reference numerals.
- the difference lies in the fact that the pressed housing 14 in the half-casing 8 , instead of having a width equal to the longest dimension of the plates of the heat exchange bundle 4 of the recirculated exhaust gas radiator, has a part 72 of enlarged cross section.
- the enlarged section 72 extends over the entire length of the cooling module. In other words, its length is equal to the length of the plates of the charge air cooler heat exchange bundle 2 , this length also corresponding to the length of the outlet header box 32 of this cooler.
- the passage cross section offered to the recirculated exhaust gases once they have passed through the cooler bundle 4 is not equal to but greater than the cross section of the heat exchange bundle 4 .
- This feature allows for better mixing of the recirculated exhaust gases with the fresh gases from the outlet header box 32 . What happens is that as soon as they leave the heat exchange bundle 4 , the recirculated exhaust gases can spread over the entire length of the cooling module. As a result, they mix with all of the charge air rather than preferentially with the charge air lying on the same side as the exhaust gas cooler.
- FIGS. 9 to 13 depict a third variant embodiment of the cooling module of the invention.
- the module of FIGS. 9 to 13 differs through the presence of a separate casing for the recirculated exhaust gas cooler bundle 4 .
- the bundle 4 of the exhaust gas cooler was housed in a housing 14 pressed directly in the half-casing 8
- the bundle 4 is housed in a casing 76 designed as a separate part and added on to the half-casing 8 .
- the casing 76 can be fixed to the half-casing 8 by any means within the competence of the person skilled in the art.
- the casing 76 is preferably assembled by brazing in a single operation.
- the single brazing operation during which the bundles 2 and 4 of the coolers are assembled and during which these bundles are assembled with one another and with the wrapper 6 (consisting of the two half-casings 7 and 8 in the examples) is put to use for assembling the separate casing 76 with the half-casing 8 .
- the presence of this additional part does not entail any additional operation for assembling the cooling module, except that of positioning the casing 76 on the half-casing 8 .
- the inlet duct 24 and the outlet duct 26 for the cooling fluid are provided on the separate casing, as is the recirculated exhaust gas inlet duct 78 .
- the added-on casing 76 may be made of the same material as the wrapper 6 or of a different material. However, if the casing 76 is to be assembled by brazing in a single operation, it is preferable for the materials to be the same.
- the separate casing 76 has a long dimension (its length) which corresponds to the length of the plates of the exhaust gas cooler heat exchange bundle 4 .
- its short dimension (its width) is greater than the short dimension of the plates of the bundle 4 so as to delimit an empty space 16 at an inlet end of the bundle 4 and an empty space 18 at an outlet end of this same bundle.
- the empty spaces 16 and 18 respectively constitute an inlet header box and an outlet header box for the recirculated exhaust gases.
- An interface plate 5 separates the charge air cooler bundle 2 from the exhaust gas cooler bundle 4 .
- the interface plate closes off the inlet and outlet header boxes 16 and 18 .
- One or more perforations 79 are formed in the interface plate 5 to place the outlet header box 18 in communication with the internal volume of the outlet header box 32 of the charge air cooler (see FIG. 13 ).
- FIGS. 9 to 13 also differs in that one of the two half-casings, in this instance the half-casing 8 , comprises an end wall 10 the width of which exceeds that of the end wall of the other half-casing, the half-casing 7 in this example.
- This arrangement is advantageous because it offers even more space for installing the recirculated exhaust gas cooler.
- the cooling module comprises an added-on separate casing 76
- the fact of increasing the width of the end wall also allows the inlet header boxes 16 and 18 to be more generously sized.
- the passage 79 which places the outlet header box 18 of the exhaust gas cooler in communication with the internal volume of the outlet box 32 of the charge air radiator has a passage cross section roughly equal to the cross section of the bundle 4 . It goes without saying that, according to a variant embodiment, this passage cross section could be enlarged so that it extends over the entire length of the plates of the charge air cooler bundle 2 , as was described with reference to FIGS. 6 to 8 . To achieve that, all that would be required would be a modification to the shape of the added-on casing 76 , equipping it with an extension 72 similar to the extension of the pressed housing 14 of FIGS. 6 to 8 .
- FIGS. 14 to 18 depict a fourth variant embodiment of the cooling module of the invention.
- This embodiment is characterized in that it comprises no added-on inlet and outlet header boxes 30 , 32 for the charge air cooler. What happens is that these header boxes are formed directly by empty spaces positioned on each side of the charge air radiator heat exchange bundle 2 .
- Each half-casing 7 , 8 has an end wall 10 that is generally flat and of square or rectangular shape, and four lateral walls 80 connected to the end wall 10 by a fillet and approximately perpendicular to this wall.
- the lateral walls 80 of the two half-casings fit together in such a way as to allow the two half-casings to slide one relative to the other in order to accommodate slight variations in height of the bundles 2 and 4 .
- a charge air inlet duct 82 is provided on the half-casing 7 and a charge air outlet duct 84 is provided on the half-casing 8 .
- the charge air enters the cooling module via the inlet duct 82 as depicted schematically by the arrow 86 . It reaches the inlet header box 88 then passes through the charge air cooler heat exchange bundle 2 exchanging heat with the cooling water. Having passed through the bundle 2 , the cooled charge air reaches the outlet header box 90 then leaves the cooling module via the duct 84 as depicted schematically by the arrow 92 .
- the recirculated exhaust gases enter the cooling module via the flange 20 , as depicted schematically by the arrow 94 ; they pass right through the heat exchange bundle 4 and emerge directly, as depicted schematically by the arrow 96 , into the outlet header box 90 of the charge air cooler.
- the passage cross section placing the exhaust gas cooler in communication with the header box 90 is equal to or greater than the passage cross section of the bundle 4 .
- the inlet and outlet ducts 82 and 84 may be made of aluminum and brazed to the half-casings 7 and 8 during the single operation of brazing the cooling module.
- they may be made of some other material, for example of plastic and mounted after the brazing operation.
- the embodiment of FIGS. 14 to 18 can therefore be achieved in a single material, for example aluminum, which allows it to be assembled entirely in a single brazing operation without even having to add on the charge air cooler inlet and outlet header boxes as had to be done in the preceding examples.
- One of the two half-casings comprises a pressed housing 14 intended to accommodate the exhaust gas cooler heat exchange bundle 4 .
- one of the dimensions of the pressed housing 14 matches the length of the plates of the bundle 4 , while the other dimension is able to form, respectively at an inlet end and at an outlet end of the bundle 4 , inlet 16 and outlet 18 header boxes for the recirculated exhaust gases.
- the pressed housing 14 could be replaced by an added-on separate casing identical to the casing 76 described previously.
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Abstract
The cooling module consists of a charge air cooler and of a recirculated exhaust gas cooler. The charge air cooler comprises a heat exchange bundle (2), an inlet header box for the air that is to be cooled and an outlet header box for the cooled air. The recirculated exhaust gas cooler comprises a heat exchange bundle (4) for cooling the recirculated exhaust gases, an inlet header box for the recirculated exhaust gases and an outlet header box for these gases. A wrapper consisting of two half-casings (7 and 8) accommodates the exchange bundles (2 and 4). The charge air cooler heat exchange bundle (2) and the recirculated exhaust gas cooler heat exchange bundle (4) are assembled in a single brazing operation. They are also assembled with one another during this same brazing operation, possibly at the same time as the two half-casings (7 and 8).
Description
- The invention relates to internal combustion engine motor vehicles.
- It relates more particularly to a cooling module consisting of a charge air cooler and of a recirculated exhaust gas cooler, the charge air cooler comprising a heat exchange bundle for cooling the charge air, an inlet header box for the air that is to be cooled immediately adjacent to an inlet end of the charge air cooler heat exchange bundle and an outlet header box for the cooled air immediately adjacent to an outlet end of the charge air cooler heat exchange bundle, the recirculated exhaust gas cooler comprising a heat exchange bundle for cooling the recirculated exhaust gases, an inlet header box for the recirculated exhaust gases which is immediately adjacent to an inlet end of the recirculated exhaust gas cooler heat exchange bundle and an outlet header box for the recirculated exhaust gases immediately adjacent to an outlet end of the recirculated exhaust gas cooler heat exchange bundle, a wrapper housing the charge air cooler heat exchange bundle and the recirculated exhaust gas cooler heat exchange bundle.
- In order to increase the specific power of motor vehicle combustion engines, it is known practise for them to be supplied with charge air that has been compressed using a compressor driven by the exhaust gases. However, this compression has the effect of raising the charge air to a high temperature. For this reason, the charge air has to be cooled before it is introduced into the combustion chambers of the engine. This cooling is performed in the conventional way in an air cooler known as a charge air cooler or intercooler.
- Furthermore, in order to meet increasingly tight pollution standards, it is known practise for some of the exhaust gases to be recirculated and mixed with the fresh inlet gases in order to lower the combustion temperature in the engine. However, these recirculated exhaust gases are at a high temperature which may be as high as about 500° C., which means that they too have to be cooled. Conventionally, this cooling is done by passing them through a recirculated exhaust gas cooler.
- In order to reduce the space occupied by these two coolers it is common practise for them to be housed in a single unit (
DE 19 853 455). That document describes a module consisting of a charge air cooler housed in a unit and of a recirculated exhaust gas cooler mounted on the charge air cooler. The main feature of this module is that there is a funnel-shaped device positioned at the interface between the charge air and recirculated gas outlets. The recirculated exhaust gas outlet is downstream of the charge air outlet. - However, assembly of a cooling module of this type is done using conventional mechanical means such as screws or bolts. It therefore entails a significant number of operations which take time and increase the cost of manufacture of the module.
- Furthermore, in order to meet increasingly tight pollution standards, a need to have more precise control over the temperature of the mixture of inlet air and recirculated gases admitted to the engine is now felt.
- The invention is aimed specifically at a cooling module that meets these objectives. The first of these objectives is achieved through the fact that the charge air cooler heat exchange bundle and the recirculated exhaust gas cooler heat exchange bundle are assembled in a single brazing operation and in that they are also assembled with one another during this same brazing operation.
- All or some of the components of the module, especially the bundles of each of the coolers, can thus be made of a single material, for example aluminum and/or an aluminum alloy.
- Advantageously, the wrapper housing the heat exchange bundles of the charge air cooler and of the recirculated exhaust gas cooler is assembled with these bundles during the single brazing operation during which these bundles are assembled with one another. In particular, the wrapper is made of the same single material, for example aluminum and/or an aluminum alloy, as the cooler bundles.
- By virtue of this feature, assembling the cooling module can be done in a single operation and without the need to resort to mechanical means of assembly such as screws or bolts. It is therefore quicker to manufacture and its cost price is lower.
- According to a first embodiment, the wrapper comprises a first and a second peripheral rim which protrude on each side of the charge air cooler bundle, the charge air cooler inlet header box being assembled with one of these peripheral rims, the charge air cooler outlet header box being assembled with the other of these peripheral rims.
- In this embodiment, the inlet and outlet header boxes of the charge air cooler are attached after the brazing operation has been performed. They can therefore be produced by molding in a different material, for example in plastic.
- According to another embodiment, the dimensions of the wrapper are chosen such that they delimit a first and a second empty space, one at the inlet end and one at the outlet end of the charge air cooler heat exchange bundle, the first and second empty spaces respectively constituting an inlet header box and an outlet header box for the charge air.
- In this embodiment, the cooling module is entirely assembled in a single operation, including the inlet and outlet header boxes delimited by the wrapper itself. The module is then produced in a single material, for example an aluminum alloy.
- In an advantageous embodiment, the wrapper comprises two half-casings. These two half-casings may be able to slide one with respect to the other in order to accommodate variations in height of at least one of the heat exchange bundles.
- When the inlet and outlet header boxes of the charge air cooler are added on, each of the two half-casings advantageously has a U-shaped cross section comprising an end wall and two lateral edges situated one on each side of the end wall, the lateral edges of one of the half-casings sliding with respect to the lateral edges of the other half-casing.
- When the cooling module is made entirely in aluminum, each of the two half-casings advantageously has the shape of a container comprising a peripheral rim, the peripheral rim of one half-casing being able to fit into the peripheral rim of the other half-casing and to slide with respect to the latter.
- Whatever the embodiment, the wrapper may, in one particular embodiment, comprise a pressed housing which accommodates the recirculated exhaust gas cooler bundle.
- In another embodiment, the wrapper comprises a separate charge air cooler casing, this separate casing being brazed in a single operation to one of the two half-casings during the single brazing operation during which the bundles are assembled with one another.
- One of the half-casings may advantageously comprise an end wall that is taller to make it easier to install the recirculated exhaust gas cooler.
- Finally, according to another advantageous feature of the invention, the cooling module comprises a passage for the recirculated exhaust gases which opens directly into the outlet header box of the charge air cooler, the cross section of this passage being equal to or greater than the cross section of the recirculated exhaust gas cooler bundle.
- By virtue of this feature, the inlet air and the recirculated gases are indeed mixed upstream of the inlet ducts. The gases can mix and their temperature can therefore even out, so that the temperature of the mixture is lowered.
- Furthermore, the fact that the passage cross section for the recirculated exhaust gases can be at least equal to the cross section of the recirculated exhaust gas cooler bundle allows these gases not to experience any pressure drop and improves the uniformity of the mixing.
- Other features and advantages of the invention will become further apparent from reading the description which follows of some exemplary embodiments which are given by way of illustration with reference to the attached figures. In these figures:
-
FIG. 1 is an external perspective view of a first embodiment of a cooling module according to the invention; -
FIG. 2 is an exploded view, minus the header boxes, of the module depicted inFIG. 1 ; -
FIG. 3 is a view of the module ofFIGS. 1 and 2 in cross section on a plane passing through the center of the exhaust gas inlet flange; -
FIG. 4 is a view of the cooling module in longitudinal section on a plane passing through the axis of one of the cooling water ducts; -
FIG. 5 is a detailed view in section illustrating the structure of the charge air cooler heat exchange bundle; -
FIG. 6 is a perspective exterior view of a variant embodiment of the module ofFIG. 1 ; -
FIG. 7 is a perspective view, minus header box, of the module ofFIG. 6 ; -
FIG. 8 is an exploded perspective view of the module ofFIGS. 6 and 7 ; -
FIG. 9 is an exterior view in perspective of a second embodiment of a cooling module according to the invention comprising added-on header boxes; -
FIG. 10 is a perspective view from beneath of the module ofFIG. 9 ; -
FIG. 11 is a perspective view, minus header box, of the module ofFIGS. 9 and 10 ; -
FIG. 12 is a view of the module ofFIG. 9 in longitudinal section on a plane passing through the axis of one of the cooling water ducts; -
FIG. 13 is a view in cross section on a plane passing through the axis of the recirculated exhaust gas inlet flange; -
FIG. 14 is an exterior perspective view of a cooling module according to the invention, made entirely in aluminum; -
FIG. 15 is a view from above of the cooling module ofFIG. 14 ; -
FIG. 16 is a view in section on XVI-XVI ofFIG. 15 ; -
FIG. 17 is a view in section on XVII-XVII ofFIG. 15 ; and -
FIG. 18 is a view in section on XVIII-XVIII ofFIG. 15 . - The cooling module of the invention is intended to equip a motor vehicle having an internal combustion engine comprising two cooling circuits: a high-temperature first circuit for cooling the combustion engine and a low-temperature second circuit for cooling certain vehicle equipment items. This module consists of a charge air cooler and of a recirculated exhaust gas cooler. Each of these coolers itself consists of a heat exchange bundle, of an inlet header box immediately adjacent to an inlet end of the heat exchange bundle and an outlet header box immediately adjacent to an outlet end of the heat exchange bundle. The gas to be cooled, namely the charge air or the recirculated exhaust gases, is introduced into the inlet header box of the cooler. It passes through the heat exchange bundle giving up heat to a cooling fluid, generally the water of the low-temperature circuit, then opens into the outlet header box.
- In the example depicted in FIGS. 1 to 5, the charge air cooler bundle is denoted by the
general reference 2 and the recirculated exhaust gas cooler bundle is denoted by thegeneral reference 4. Thebundles FIG. 2 ). - In order to reduce the space required by the module, as previously explained, the
bundles common wrapper 6. In the embodiment of FIGS. 1 to 5, thewrapper 6 consists of two half-casings, namely a first half-casing 7 and a second half-casing 8. Each half-casing end wall 10 and twolateral edges 12 situated one on each side of theend wall 10. The lateral edges 10 of the half-casings wrapper 6 to accommodate dimensional variations in theheat exchange bundles - One of the two half-casings, in this instance the half-
casing 8, has ahousing 14, made for example by pressing and intended to accommodate the recirculated exhaust gascooler bundle 4. As can be seen more specifically inFIG. 4 , in one of its dimensions, directed along the longest dimension of theheat exchange bundle 4, thehousing 14 is dimensioned in such a way as to fit the length of thebundle 4. By contrast, as can be seen more particularly inFIG. 3 , in its other dimension, directed along the width of theheat exchange bundle 4, thehousing 14 is dimensioned in such a way as to form anempty space 16 at theinlet end 17 of thebundle 4 and anempty space 18 at the outlet end 19 of this same bundle. Theempty spaces inlet header box 16 and anoutlet header box 18 for the recirculated exhaust gas cooler. - An
inlet flange 20 is connected to aninlet duct 22 which opens into the inlet header box 16 (FIG. 3 ). Theflange 20 is for the connection of an inlet pipe (not depicted) carrying the exhaust gases that are to be cooled. Aninlet duct 24 and anoutlet duct 26 are also provided on thehousing 14 of the half-casing 8. Theducts cooler bundle 4 and the charge aircooler bundle 2. In the module depicted, the channels along which the cooling fluid circulates through thebundles ducts - The cooling module depicted in FIGS. 1 to 5 further comprises an
inlet header box 30 and anoutlet header box 32 for the charge air. Unlike theheader boxes inlet 30 andoutlet 32 header boxes of the charge air cooler are not directly delimited by thewrapper 6 but are added on. That allows them to be made of a material that differs from that of thewrapper 6 and of theheat exchange bundles inlet duct 34 and the outlet header box anoutlet duct 36. The charge air enters the inlet header box via theduct 34 as depicted schematically by thearrow 38, passes through theheat exchange bundle 2, then opens into theoutlet header box 32 before leaving the heat exchange module in theoutlet duct 36 as depicted diagrammatically by thearrow 40. - To allow the inlet and outlet header boxes of the charge air cooler to be fixed to the
wrapper 6, each of the two half-casings cooler bundle 4. Advantageously, grooves (not depicted) are formed in the feet of theheader boxes casings - As can be seen more particularly in
FIG. 5 which depicts a detailed view in section of the charge air coolerheat exchange bundle 2, each of theheat exchange bundles plates 42 between which there arecorrugated inserts 44 constituting heat-exchange surfaces which improve the exchange of heat between the charge air that is to be cooled and the plates. Each plate is of roughly rectangular shape having two short sides and two long sides. Each plate comprises anend wall 46 bounded by aperipheral rim 48.Ribs 50 may be provided in theend wall 46 of each of the plates to delimit circulation passages for the cooling fluid (FIG. 2 ). - The
end wall 46 and theperipheral rim 48 determine a shallow dish. The plates are grouped together in pairs assembled by theirperipheral rim 48. Thus, the dish of the top plate and the dish of the bottom plate belonging to the same pair of plates combine to form achannel 52 through which the cooling fluid can circulate. Furthermore, twobosses 54 are formed along a short side of each of the plates. The bosses of a pair of plates press against the bosses of the adjacent plate pairs. This then produces an inlet manifold and an outlet manifold for the cooling fluid. The cooling fluid enters the bundle as depicted diagrammatically by thearrow 56 then flows through thecirculation channels 52 as depicted diagrammatically by thearrows 58. The fluid leaves theheat exchange bundle 2 in the opposite direction. - The
bosses 54 of two pairs of plates also between them determinecirculation channels 60 for the charge air of the charge air cooler and for the exhaust gases of the exhaust gas cooler.Turbulence generators 44 are positioned in thecirculation passages 60. - As regards the recirculated exhaust gas
cooler bundle 4 more particularly, each circulation channel for the exhaust gases that are to be cooled may advantageously lie between two channels for the circulation of the cooling liquid. By virtue of this feature, the wall of the pressedhousing 14 and theinterface plate 5 are not in direct contact with the gases that are to be cooled, the temperature of which may be very high (500° C.). On the contrary, these walls are cooled by the circulation of the cooling liquid. Their temperature is thus considerably lowered by comparison with the wall temperature of a conventional recirculated exhaust gas cooler. It may for example be of the order of 200° C. These walls can therefore be made in a material with less resistance to temperature, such as aluminum. This advantage is considerable because aluminum is easier to work and less expensive than stainless steel. - As can be seen more specifically in
FIG. 3 , theempty space 18 formed in thehousing 14, which constitutes the outlet header box for the recirculated exhaust gas cooler is in direct communication with theinterior space 70 of theoutlet header box 32 of the charge air cooler. In consequence, the cross section of the passage offered to the cooled recirculated exhaust gases is the cross section of theoutlet header box 18. This cross section is equal to the cross section of the exhaust gascooler bundle 4. These exhaust gases can therefore arrive in the charge air cooleroutlet header box 32 without their flow being retarded. In particular, they do not have to negotiate any passage of narrowed cross section which would incur a pressure drop. - FIGS. 6 to 8 depict a variant embodiment of the cooling module of FIGS. 1 to 5. The overall construction of the cooler of FIGS. 6 to 8 is identical to that of the first embodiment. In consequence, the same elements have been denoted by the same reference numerals. The difference lies in the fact that the pressed
housing 14 in the half-casing 8, instead of having a width equal to the longest dimension of the plates of theheat exchange bundle 4 of the recirculated exhaust gas radiator, has apart 72 of enlarged cross section. In the example, theenlarged section 72 extends over the entire length of the cooling module. In other words, its length is equal to the length of the plates of the charge air coolerheat exchange bundle 2, this length also corresponding to the length of theoutlet header box 32 of this cooler. - As a result, in this embodiment, the passage cross section offered to the recirculated exhaust gases once they have passed through the
cooler bundle 4 is not equal to but greater than the cross section of theheat exchange bundle 4. This feature allows for better mixing of the recirculated exhaust gases with the fresh gases from theoutlet header box 32. What happens is that as soon as they leave theheat exchange bundle 4, the recirculated exhaust gases can spread over the entire length of the cooling module. As a result, they mix with all of the charge air rather than preferentially with the charge air lying on the same side as the exhaust gas cooler. - FIGS. 9 to 13 depict a third variant embodiment of the cooling module of the invention. In these figures, the same elements bear the same reference numerals as in the preceding figures. The module of FIGS. 9 to 13 differs through the presence of a separate casing for the recirculated exhaust gas
cooler bundle 4. Whereas, in the previous two embodiments, thebundle 4 of the exhaust gas cooler was housed in ahousing 14 pressed directly in the half-casing 8, in this embodiment, thebundle 4 is housed in acasing 76 designed as a separate part and added on to the half-casing 8. Thecasing 76 can be fixed to the half-casing 8 by any means within the competence of the person skilled in the art. However, thecasing 76 is preferably assembled by brazing in a single operation. In other words, the single brazing operation during which thebundles casings separate casing 76 with the half-casing 8. Thus, the presence of this additional part does not entail any additional operation for assembling the cooling module, except that of positioning thecasing 76 on the half-casing 8. Theinlet duct 24 and theoutlet duct 26 for the cooling fluid are provided on the separate casing, as is the recirculated exhaustgas inlet duct 78. - The added-on
casing 76 may be made of the same material as thewrapper 6 or of a different material. However, if thecasing 76 is to be assembled by brazing in a single operation, it is preferable for the materials to be the same. - Just as for the pressed
housing 14, theseparate casing 76 has a long dimension (its length) which corresponds to the length of the plates of the exhaust gas coolerheat exchange bundle 4. By contrast, its short dimension (its width) is greater than the short dimension of the plates of thebundle 4 so as to delimit anempty space 16 at an inlet end of thebundle 4 and anempty space 18 at an outlet end of this same bundle. Theempty spaces interface plate 5 separates the charge aircooler bundle 2 from the exhaust gascooler bundle 4. The interface plate closes off the inlet andoutlet header boxes more perforations 79, forming communication passages, are formed in theinterface plate 5 to place theoutlet header box 18 in communication with the internal volume of theoutlet header box 32 of the charge air cooler (seeFIG. 13 ). - The embodiment of FIGS. 9 to 13 also differs in that one of the two half-casings, in this instance the half-
casing 8, comprises anend wall 10 the width of which exceeds that of the end wall of the other half-casing, the half-casing 7 in this example. This arrangement is advantageous because it offers even more space for installing the recirculated exhaust gas cooler. In particular, when the cooling module comprises an added-onseparate casing 76, it is necessary to provide, at the periphery of this casing, an empty region so that the contacting surfaces of thecasing 76 and of theend wall 10 can be brazed. The fact of increasing the width of the end wall also allows theinlet header boxes - It is pointed out that, in this embodiment, the
passage 79 which places theoutlet header box 18 of the exhaust gas cooler in communication with the internal volume of theoutlet box 32 of the charge air radiator has a passage cross section roughly equal to the cross section of thebundle 4. It goes without saying that, according to a variant embodiment, this passage cross section could be enlarged so that it extends over the entire length of the plates of the charge aircooler bundle 2, as was described with reference to FIGS. 6 to 8. To achieve that, all that would be required would be a modification to the shape of the added-oncasing 76, equipping it with anextension 72 similar to the extension of the pressedhousing 14 of FIGS. 6 to 8. - FIGS. 14 to 18 depict a fourth variant embodiment of the cooling module of the invention. This embodiment is characterized in that it comprises no added-on inlet and
outlet header boxes heat exchange bundle 2. - Each half-
casing end wall 10 that is generally flat and of square or rectangular shape, and fourlateral walls 80 connected to theend wall 10 by a fillet and approximately perpendicular to this wall. Thelateral walls 80 of the two half-casings fit together in such a way as to allow the two half-casings to slide one relative to the other in order to accommodate slight variations in height of thebundles air inlet duct 82 is provided on the half-casing 7 and a chargeair outlet duct 84 is provided on the half-casing 8. - As can be seen in particular in
FIG. 16 , the charge air enters the cooling module via theinlet duct 82 as depicted schematically by thearrow 86. It reaches theinlet header box 88 then passes through the charge air coolerheat exchange bundle 2 exchanging heat with the cooling water. Having passed through thebundle 2, the cooled charge air reaches theoutlet header box 90 then leaves the cooling module via theduct 84 as depicted schematically by thearrow 92. The recirculated exhaust gases enter the cooling module via theflange 20, as depicted schematically by the arrow 94; they pass right through theheat exchange bundle 4 and emerge directly, as depicted schematically by thearrow 96, into theoutlet header box 90 of the charge air cooler. - Advantageously, the passage cross section placing the exhaust gas cooler in communication with the
header box 90 is equal to or greater than the passage cross section of thebundle 4. - The inlet and
outlet ducts casings duct 82 in the example, they may be made of some other material, for example of plastic and mounted after the brazing operation. The embodiment of FIGS. 14 to 18 can therefore be achieved in a single material, for example aluminum, which allows it to be assembled entirely in a single brazing operation without even having to add on the charge air cooler inlet and outlet header boxes as had to be done in the preceding examples. - One of the two half-casings, the half-
casing 8 in the example, comprises a pressedhousing 14 intended to accommodate the exhaust gas coolerheat exchange bundle 4. As already described earlier, one of the dimensions of the pressedhousing 14 matches the length of the plates of thebundle 4, while the other dimension is able to form, respectively at an inlet end and at an outlet end of thebundle 4,inlet 16 andoutlet 18 header boxes for the recirculated exhaust gases. It goes without saying that, in an embodiment variant, the pressedhousing 14 could be replaced by an added-on separate casing identical to thecasing 76 described previously.
Claims (16)
1. A cooling module consisting of a charge air cooler and a recirculated exhaust gas cooler, the charge air cooler comprising a heat exchange bundle (2) for cooling the charge air and the recirculated exhaust gas cooler comprising a heat exchange bundle (4) for cooling the recirculated exhaust gases, characterized in that the charge air cooler heat exchange bundle (2) and the recirculated exhaust gas cooler heat exchange bundle (4) are assembled in a single brazing operation and in that they are also assembled with one another during this same brazing operation.
2. The cooling module as claimed in claim 1 , further comprising a wrapper (6) housing the charge air cooler and recirculated exhaust gas cooler bundles (2, 4), said wrapper (6) being assembled with these bundles during the single brazing operation during which these bundles are assembled with one another.
3. The cooling module as claimed in claim 2 , characterized in that the charge air cooler further comprises an inlet header box (30) for the air that is to be cooled immediately adjacent to an inlet end of the charge air cooler heat exchange bundle (2) and an outlet header box (32) for the cooled air immediately adjacent to an outlet end of the charge air cooler heat exchange bundle (2), and in that the wrapper (6) comprises a first and a second peripheral rim which protrude on each side of the charge air cooler bundle (2), the charge air cooler inlet header box being assembled with one of these rims, the charge air cooler outlet header box (32) being assembled with the other of these peripheral rims.
4. The cooling module as claimed in claim 3 , characterized in that the dimensions of the wrapper (6) are chosen such that they delimit a first and a second empty space (88, 90), one at an inlet end and one at an outlet end of the charge air cooler heat exchange bundle (2), the first and second empty spaces respectively constituting an inlet header box and an outlet header box for the charge air.
5. The cooling module as claimed in claim 2 4, characterized in that the wrapper (6) comprises two half-casings (7, 8).
6. The cooling module as claimed in claim 5 , characterized in that the two half-casings (7, 8) are able to slide one with respect to the other in order to accommodate variations in height of at least one of the heat exchange bundles (2, 4).
7. The cooling module as claimed in claim 5 , characterized in that each of the two half-casings (7, 8) has a U-shaped cross section comprising an end wall (10) and two lateral edges (12) situated one on each side of the end wall (10), the lateral edges (12) of one of the half-casings sliding with respect to the lateral edges of the other half-casing.
8. The cooling module as claimed in claim 5 , characterized in that each of the two half-casings (7, 8) has the shape of a container comprising a peripheral rim, the peripheral rim of one half-casing being able to fit into the peripheral rim of the other half-casing and to slide with respect to the latter.
9. The cooling module as claimed in claim 2 , characterized in that the wrapper (6) comprises a pressed housing (14) which accommodates the recirculated exhaust gas cooler bundle (4).
10. The cooling module as claimed in claim 2 , characterized in that the wrapper (6) comprises a separate recirculated exhaust gas cooler casing (73), this separate casing (73) being brazed in a single operation to one of the two half-casings (7, 8) during the single brazing operation during which the bundles (2, 4) are assembled with one another.
11. The cooling module as claimed in claim 9 , characterized in that the recirculated exhaust gas cooler comprises an inlet header box (16) for the recirculated exhaust gases immediately adjacent to an inlet end of the recirculated exhaust gas cooler heat exchange bundle (4) and an outlet header box (18) for the recirculated exhaust gases immediately adjacent to an outlet end of the recirculated exhaust gas cooler heat exchange bundle (4), the housing (14) or the separate casing (76) for the recirculated exhaust gas cooler bundle (4) delimiting a first and a second empty space (16, 18), one at an inlet end and one at an outlet end of the recirculated exhaust gas cooler heat exchange bundle, the first and second empty spaces respectively constituting the inlet header box (16) and the outlet header box (18) for the recirculated exhaust gases.
12. The cooling module as claimed in claim 5 , characterized in that at least one of the two half-casings comprises an end wall which is taller so as to make it easier to install the recirculated exhaust gas cooler.
13. The cooling module as claimed in claim 5 , characterized in that it comprises a passage (18, 72, 79) for the recirculated exhaust gases which opens directly into the outlet header box (32) of the charge air cooler, the cross section of this passage being equal to or greater than the cross section of the recirculated exhaust gas cooler bundle (4).
14. The cooling module as claimed in claim 1 in which the charge air cooler heat exchange bundle (2) and the recirculated exhaust gas cooler heat exchange bundle (4) are made of aluminum and/or aluminum alloy.
15. The cooling module as claimed in claim 14 in which the wrapper (6) is also made of at least one of aluminum and aluminum alloy.
16. The cooling module as claimed in claim 15 in which the header boxes (16, 18, 30, 32) of said coolers are also made of at least one of aluminum and aluminum alloy.
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR03/07674 | 2003-06-25 | ||
FR0307674A FR2856746B1 (en) | 2003-06-25 | 2003-06-25 | MODULE FOR COOLING THE EXHAUST AIR AND RECIRCULATED GASES OF AN INTERNAL COMBUSTION ENGINE OF A MOTOR VEHICLE |
FR03/14044 | 2003-11-28 | ||
FR0314044A FR2856747B1 (en) | 2003-06-25 | 2003-11-28 | MODULE FOR COOLING EXHAUST AIR AND RECIRCULATED EXHAUST GASES OF AN INTERNAL COMBUSTION ENGINE OF A MOTOR VEHICLE. |
PCT/FR2004/001595 WO2005001272A1 (en) | 2003-06-25 | 2004-06-24 | Module for cooling the charge air and recirculated exhaust gases from the internal combustion engine of a motor vehicle |
Publications (1)
Publication Number | Publication Date |
---|---|
US20060278377A1 true US20060278377A1 (en) | 2006-12-14 |
Family
ID=33518423
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/561,847 Abandoned US20060278377A1 (en) | 2003-06-25 | 2004-06-24 | Module for cooling the charge air and recirculated exhaust gases from the internal combustion engine of a motor vehicle |
Country Status (9)
Country | Link |
---|---|
US (1) | US20060278377A1 (en) |
EP (2) | EP1646780B1 (en) |
KR (1) | KR20060063807A (en) |
AT (2) | ATE355453T1 (en) |
DE (2) | DE602004005041T3 (en) |
ES (1) | ES2285511T5 (en) |
FR (1) | FR2856747B1 (en) |
PL (1) | PL1636478T5 (en) |
WO (2) | WO2005001272A1 (en) |
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Also Published As
Publication number | Publication date |
---|---|
ES2285511T3 (en) | 2007-11-16 |
PL1636478T3 (en) | 2007-08-31 |
ES2285511T5 (en) | 2013-10-10 |
DE602004005041T3 (en) | 2013-10-31 |
ATE399933T1 (en) | 2008-07-15 |
EP1646780B1 (en) | 2008-07-02 |
EP1646780A1 (en) | 2006-04-19 |
DE602004005041D1 (en) | 2007-04-12 |
FR2856747A1 (en) | 2004-12-31 |
EP1636478B1 (en) | 2007-02-28 |
PL1636478T5 (en) | 2014-02-28 |
EP1636478B2 (en) | 2013-05-29 |
EP1636478A1 (en) | 2006-03-22 |
WO2005001271A1 (en) | 2005-01-06 |
WO2005001272A1 (en) | 2005-01-06 |
ATE355453T1 (en) | 2006-03-15 |
DE602004014774D1 (en) | 2008-08-14 |
KR20060063807A (en) | 2006-06-12 |
DE602004005041T2 (en) | 2007-11-08 |
FR2856747B1 (en) | 2005-09-23 |
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